Reddit mentions of The Classics 12-Pack Triangle Pencil Grips, Assorted Bright Colors, 1.75-Inch Long (TPG-16212)

For the eyeliners, or even smaller brushss, have you tried those blocky pencil grips? They're pretty angular and you can put more than one on if you need more grip space. I don't know how difficult they would be to put on initially, though.

Edit: Revlon also has a new-ish mascara line in a bottle similar to the Revolution lip glosses. Here's a random blog post I found going over the formulas.

Your kid will grow up into a world of typing most things by the 5th grade. It's not a bad thing, i've been in the same situation since kindergarten. I would say improve by getting college ruled paper and teaching him about spacing his letters and basically have him write out the alphabet and coach him on correctly placing the characters on the line to improve neatness. My first grade teacher gave me one of these and it improved me
a bit http://www.amazon.com/gp/aw/d/B00FQQRRIQ/ref=pd_aw_sims_1?pi=SS115

My Grandfather has awful adhd and doesn't really write at all. My dad has really bad adhd and writes basically sideways, he happened to be a silicon valley business man so typing devices have been available to him his whole life. I also have adhd as well. At a young age i found a special interest in computers because i could type faster than other students and it was rewarding because with my handwriting, keyboards were essential. Here I am a senior in high school who has worse handwriting than a 4th grader. I was given a packet to fill out to present to my schools college counselor for a meeting regarding letters of recommendation for private colleges. I tried my hardest and wrote about one character per a second (probably slower) and still handed in a messy document. If it becomes a problem never give up because some that would not be fun to run into the same problems as i do.

I am not a lefty, but my teacher mom says that 3 sided grips for writing utensils helps those learning to write for the first time. Also you can find triangular pencils and crayons! https://www.amazon.com/dp/B00FQQRRIQ/ref=cm_sw_r_cp_apa_i_TSliDbHYTHFWV